I need help I want to retrieve my mac pro book

I need help I want to retrieve my mac pro book and now I can not bcz Yosimoto os is not avilabe what can do?

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If you have installed Yosemite by downloading it from the App Store, it will be in your App Store purchases tab. If Yosemite is currently installed, when you start in the recovery Partition (command - R on a restart), you can reinstall Yosemite.  In the recovery Partition, you can also restore Time machine and disk utility is available.

Tags: Mac OS & System Software

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